<?php
/** 
 * 
 *
 * @package api
 * @subpackage lang
 * @author $Author$
 * 
 * @version $Id: Object.php 14 2006-11-28 22:05:19Z rdff3 $
 */
 
/**
 * Class Object
 * 
 * Class {@link Object} is the root of the class hierarchy.  Every class has {@link Object} as a superclass.  All objects 
 * implement the methods of this class. 
 *
 * @package api
 * @subpackage lang
 * @author $Author$
 */
class Object {	

	public function __construct() { }
	
	/**
	 * Indicates whether some other object is "equal to" this one.
	 *
	 * The equals method implements an equivalence relation on non-null object references:
	 * <ul>
	 * 	<li>It is reflexive: for any non-null reference value x, x.equals(x) should return true. </li>
	 * 	<li>It is symmetric: for any non-null reference values x and y, x.equals(y)  should return true if and only if y.equals(x) 
	 		returns true.</li>
	 * 	<li>It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns 
	 		true, then x.equals(z) should return true.</li>
	 * 	<li>It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return 
	 		true or consistently return false, provided no information used in equals comparisons on the objects is modified.</li>
	 * 	<li>For any non-null reference value x, x.equals(null) should return false.</li>
	 * </ul>
	 *
	 * The equals method for class Object implements the most discriminating possible equivalence relation on objects; 
	 * that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the 
	 * same object (x == y has the value true).
	 *
	 * Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as 
	 * to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes. 
	 *
	 * @param Object $obj the reference object with which to compare.
	 * @returns boolean true if this object is the same as the $obj argument, false otherwise.
	 */
	public function equals( Object $obj ) {
		return ($this === $obj);
	}
	
	/**
	 * Returns the runtime class of an object.	
	 *
	 * @returns string the string representation of the runtime class of the object.
	 */
	public final function getClass() {
		return get_class($this);
	}
	
	/**
	 * Returns a hash code value for the object.
	 * 
	 * The general contract of hashCode is:
	 * <ul>
	 * 	<li>Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode 
	 		method must consistently return the same integer, provided no information used in equals comparisons on the 
			object is modified. This integer need not remain consistent from one execution of an application to another 
			execution of the same application.</li>
     * 	<li>If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the 
	 		two objects must produce the same integer result.</li>
     * 	<li>It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling 
	 		the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should 
			be aware that producing distinct integer results for unequal objects may improve the performance of hashtables. </li>
	 * </ul>
	 * As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects.
	 *
	 * @returns int a hash code value for this object
	 */
	public function hashCode() {
		return hash("md5", $this->__toString());
	}
	
	public function toString() {
		return var_export($this, true);
	}
	
	/**
	 * Returns the string representation of this object
	 *
	 * @returns string a string string representation of this object
	 */
	public function __toString() {
		return $this->toString();
	}
}



?>